Test results are reviewed for two annular liquid seals (L = 34.9 mm; D = 76.5 mm) at two clearances (.1 and .12 mm). The seal stators use hole-pattern-roughened stators that are identical except for hole depths of .28 and 2.0 mm. Tests are conducted at three speeds out to 24,600 rpm and three pressures out to 68 bars. Test data consist of leakage rates and rotordynamic coefficients at centered and eccentric positions with static eccentricity ratios out to 0.5. Test results are consistent with expectations in regard to the reduction of cross-coupled stiffness coefficients due to stator roughness. However, the measured direct stiffness coefficients were unexpectedly low. A partial explanation for these results is provided by measured friction factor data which show an increase in the friction factors for pressure-driven flow with an increase in clearance. A prediction model for rotordynamic coefficients, incorporating the friction-factor data, predicted a substantial loss in direct stiffness but could not explain the very low (or negative) values that were measured. The model did explain the measured drop in cross coupled stiffness (k) and provides an alternative explanation to observed reductions in k values; specifically, an increase in the friction factor with increasing clearance causes a reduction in k irrespective of any parallel reduction in the average circumferential velocity.
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January 1999
Research Papers
Test Results for Liquid “Damper” Seals Using a Round-Hole Roughness Pattern for the Stators
Dara W. Childs,
Dara W. Childs
Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843
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Patrice Fayolle
Patrice Fayolle
Socie´te´ Europe´enne de Propulsion, Division Grosse Propulsion Liquide, B.P. 802, 27207 Vernon, France
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Dara W. Childs
Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843
Patrice Fayolle
Socie´te´ Europe´enne de Propulsion, Division Grosse Propulsion Liquide, B.P. 802, 27207 Vernon, France
J. Tribol. Jan 1999, 121(1): 42-49 (8 pages)
Published Online: January 1, 1999
Article history
Received:
September 2, 1997
Revised:
December 29, 1997
Online:
January 24, 2008
Citation
Childs, D. W., and Fayolle, P. (January 1, 1999). "Test Results for Liquid “Damper” Seals Using a Round-Hole Roughness Pattern for the Stators." ASME. J. Tribol. January 1999; 121(1): 42–49. https://doi.org/10.1115/1.2833809
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